Defender jumping laterally bumps into offensive player doing a lay-up.

[Adam]

Originally Posted by ILMalti

The defender can only claim ownership of the spot he started his/her jump from.
if, as in the case of you scenario, on landing the offensive was hit at a different spot from take off , then a blocking foul on the defender should be called (I would anyway).

This is not true of the defender had established LGP, in which case he can be moving sideways or backwards when contact is made. He does not need to be on the floor in order to take advantage of the extra benefits granted for having LGP.

The caveat is whether or not the offensive player had jumped as well, in which case the defender would need to be in position prior to the offensive player jumping.